NT6D80 MSDL card Page 419 of 906Circuit Card Description and InstallationManually isolating and correcting faultsProblems are due to configuration errors that occur during installation orhardware faults resulting from component failure during operation. See“Symptoms and actions” on page 422 for more information on problemsymptoms and required responses.Isolate MSDL faults using the diagnostic tools described below:1 Observe and list the problem symptoms; for example, a typical symptomis a permanently lit LED.2 If the LED flashes three times but the card does not enable, verify thatthe card is installed in a proper slot.3 Check that the address is unique; no other card in the system can bephysically set to the same device number as the MSDL.4 If installation is correct and no address conflict exists, refer to “Newlyinstalled MSDL cards” on page 419 or “Previously operating MSDLcards” on page 420.5 If the MSDL still does not operate correctly, contact your Nortelrepresentative.Newly installed MSDL cardsProblems that occur during MSDL card installation usually result fromimproperly installed, incorrectly addressed, or faulty cards.If the LED on a newly installed MSDL does not flash three times afterinsertion, wait 5 minutes, then remove and reinsert. If the LED still does notflash three times, the card is faulty.
